I've made some macros that act like a global transpose for all audio/MIDI tracks in a project.
To use them you'll need sws extensions, I have version 2.9.7 installed.
I've mapped them to the following shortcut keys:
Audio
alt + - (down a semitone)
alt + = (up a semitone)
ctrl + alt + - (down an octave)
ctrl + alt + = (up an octave)
MIDI
ctrl + - (down a semitone)
ctrl + = (up a semitone)
ctrl + shift + - (down an octave)
ctrl + shift + = (up an octave)
https://stash.reaper.fm/35221/Audio-...e%20Macros.zip